From c4d671497933ff5df718430ec35d7074fe458510 Mon Sep 17 00:00:00 2001
From: sefler <sefler@126.com>
Date: Mon, 12 Sep 2022 13:29:11 +0800
Subject: [PATCH] touchpad scrolling works now

---
 common/xrdp_constants.h |  4 ++++
 xrdp/xrdp_wm.c          | 43 +++++++++++++++++++++++++++++++++++++++--
 2 files changed, 45 insertions(+), 2 deletions(-)

diff --git a/common/xrdp_constants.h b/common/xrdp_constants.h
index 1e844697..7824b318 100644
--- a/common/xrdp_constants.h
+++ b/common/xrdp_constants.h
@@ -270,6 +270,10 @@
 #define WM_BUTTON8DOWN 116
 #define WM_BUTTON9UP   117
 #define WM_BUTTON9DOWN 118
+
+#define WM_TOUCH_VSCROLL 140
+#define WM_TOUCH_HSCROLL 141
+
 #define WM_INVALIDATE  200
 
 #define CB_ITEMCHANGE  300
diff --git a/xrdp/xrdp_wm.c b/xrdp/xrdp_wm.c
index 61261a97..828d0a72 100644
--- a/xrdp/xrdp_wm.c
+++ b/xrdp/xrdp_wm.c
@@ -1230,6 +1230,28 @@ xrdp_wm_clear_popup(struct xrdp_wm *self)
     return 0;
 }
 
+/*****************************************************************************/
+int
+xrdp_wm_mouse_touch(struct xrdp_wm *self, int gesture, int param)
+{
+    LOG(LOG_LEVEL_INFO, "mouse touch event gesture %d param %d", gesture, param);
+
+    switch (gesture) {
+        // vertical scroll
+        case 0:
+            self->mm->mod->mod_event(self->mm->mod, WM_TOUCH_VSCROLL,
+                                            self->mouse_x, self->mouse_y, param, 0);
+            break;
+        // horizantal scroll
+        case 1:
+            self->mm->mod->mod_event(self->mm->mod, WM_TOUCH_HSCROLL,
+                                            self->mouse_x, self->mouse_y, param, 0);
+            break;
+    }
+
+    return 0;
+}
+
 /*****************************************************************************/
 int
 xrdp_wm_mouse_click(struct xrdp_wm *self, int x, int y, int but, int down)
@@ -1775,13 +1797,30 @@ xrdp_wm_process_input_mouse(struct xrdp_wm *self, int device_flags,
     /* vertical mouse wheel */
     if (device_flags & PTRFLAGS_WHEEL)
     {
+        int delta = 0;
         if (device_flags & PTRFLAGS_WHEEL_NEGATIVE)
         {
-            xrdp_wm_mouse_click(self, 0, 0, 5, 0);
+            delta = (device_flags & WheelRotationMask) | ~WheelRotationMask;
+            if (delta != 0) 
+            {
+                xrdp_wm_mouse_touch(self, 0, delta);
+            }
+            else
+            {
+                xrdp_wm_mouse_click(self, 0, 0, 5, 0);
+            }
         }
         else
         {
-            xrdp_wm_mouse_click(self, 0, 0, 4, 0);
+            delta = device_flags & WheelRotationMask;
+            if (delta != 0)
+            {
+                xrdp_wm_mouse_touch(self, 0, delta);
+            }
+            else
+            {
+                xrdp_wm_mouse_click(self, 0, 0, 4, 0);
+            }
         }
     }